Fig. 2From: Limb patterning genes and heterochronic development of the emu wing budGrowth of emu limb buds and cell proliferation at HH stage 19 (a) and stage 21 (b). Transverse sections. The apical ectodermal ridge (AER) is indicated by a white arrow in DAPI-stained sections. Green PH3 expression (a marker of cell proliferation); red PAX7 expression. There are fewer proliferating cells in the forelimb bud, and those that are proliferating are not immigrating PAX7+ cells. Bar 100 µmBack to article page